Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1186/s40517-020-0161-4
Licence creative commons licence
Title (Primary) Optimization of the utilization of deep borehole heat exchangers
Author Pan, S.; Kong, Y.; Chen, C. ORCID logo ; Pang, Z.; Wang, J.
Journal Geothermal Energy
Year 2020
Department ENVINF
Volume 8
Page From art. 6
Language englisch
Keywords Deep-borehole heat exchanger, Geothermal energy, Sensitivity analysis, Optimal heat extraction rate, Economic analysis
Abstract Deep-borehole heat exchangers (DBHE) are generally coaxial pipes installed in deep boreholes and has become an alternative approach to utilize geothermal energy. Since the performance of the DBHE system can be affected by several parameters, it is important to optimize the design of parameters for the DBHE. In this paper, based on the analytical method, we carried out the sensitivity analysis of DBHE design parameters, including outer pipe diameter, inner pipe diameter, flow rate, outer pipe materials, grout materials, and borehole depth during continuous operation for 4 months. The sensitivity analysis results indicate that the heat extraction rate can be significantly affected by outer pipe diameter, borehole depth, and flow rate. The effects of grout materials, inner pipe diameter and outer pipe materials are of second-order. Finally, an optimization method based on the lowest Average Energy Cost index was proposed to optimize these DBHE design parameters under different geological conditions. Given the cost in this study, a combination scheme of all the optimal parameters is given for different depth wells under different geological conditions.
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Pan, S., Kong, Y., Chen, C., Pang, Z., Wang, J. (2020):
Optimization of the utilization of deep borehole heat exchangers
Geotherm. Energy 8 , art. 6